SWDM40 OPERATION & MAINTENANCE MANUAL
pressure, and each section Kelly bar can retract and extend freely in teeth opened. The top inner
kelly bar is connected to the steel rope by a swivel and the bottom square connects to the
drilling tool. The kelly bar can be retracted (inner locking bar disengage) by main winch wire
rope
2.3.7.2 Drilling Tools
Drilling tools can be chosen according to real soil condition, and suitable soil condition is
in table 2-1.
Table 2-1
Drill Buckets Features and Suitable Soil Condition
Soil bucket within single open
Single layer base board，large soil
entrance
Clay, strong cementing capacity
stratum
Soil bucket within double
open
Single layer base board, drill smoothly
Loosening soil, good cementing
capacity boulder
Single layer base board, main body can
be divided into two half，discharge soil
conveniently
Integrated stratum cement clay
Side open soil bucket within
double open
Single layer base board，large soil
entrance，drill smoothly
Clay within boulder loosening soil
stratum
S-type tapered bottom
bucket
Single layer base board，bucket can be
fully opened in side.
Clay, strong cementing capacity
stratum
Multiple-layer base board，cuttings are
set in the bucket bottom.
Boulder, compact gravel stratum
Sand bucket within single
open
Double layers base board，large soil
entrance.
Big pebble, frozen soil, high
weathering soft base stratum
Sand bucket within double
open
Double layers base board，two soil
entrances.
Medium and small-sized pebble,
frozen soil, high weathering soft
base stratum
Barrel-type core bucket
within side open
Single & double-layer base board，
cuttings are set in the bucket bottom
surrounding
Large boulder, float stone stratum
Barrel-type ring core bucket
No base board，No cuttings in the bucket
bottom surrounding
Large boulder, float stone stratum
Upper opened under-reamed
bucket
Big reaming angle，small swing torque
Lower opened
under-reamed bucket
Small reaming angle，large swing torque
Stable soil layer, complicated
stratum
To Next Page
Loading...